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Support the Netscape application extension for gif animations (#95060):

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This commit is contained in:
Matthias Clasen 2002-10-20 22:16:58 +00:00
parent 6a82d4c61f
commit 817ad6d3f8
4 changed files with 62 additions and 8 deletions
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13
gdk-pixbuf/ChangeLog
View File

@ -1,3 +1,16 @@
2002-10-21 Matthias Clasen <maclas@gmx.de>
Support the Netscape application extension for gif animations
(#95060):
* io-gif-animation.h:
* io-gif-animation.c (gdk_pixbuf_gif_anim_iter_advance):
Add loop count to GdkPixbufGifAnim and use it in the advance
method of GdkPixbufGifAnimIter.
* io-gif.c (gif_get_extension): Parse Netscape application
extension block and set the animation loop count.
2002-10-11 Matthias Clasen <maclas@gmx.de>
* gdk-pixbuf-loader.c (gdk_pixbuf_loader_get_format): Remove

12
gdk-pixbuf/io-gif-animation.c
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@ -260,6 +260,7 @@ gdk_pixbuf_gif_anim_iter_advance (GdkPixbufAnimationIter *anim_iter,
{
GdkPixbufGifAnimIter *iter;
gint elapsed;
gint loop;
GList *tmp;
GList *old;
@ -285,12 +286,17 @@ gdk_pixbuf_gif_anim_iter_advance (GdkPixbufAnimationIter *anim_iter,
/* See how many times we've already played the full animation,
* and subtract time for that.
*/
loop = elapsed / iter->gif_anim->total_time;
elapsed = elapsed % iter->gif_anim->total_time;
iter->position = elapsed;
/* Now move to the proper frame */
tmp = iter->gif_anim->frames;
if (iter->gif_anim->loop == 0 || loop < iter->gif_anim->loop)
tmp = iter->gif_anim->frames;
else
tmp = NULL;
while (tmp != NULL) {
GdkPixbufFrame *frame = tmp->data;
@ -525,7 +531,7 @@ gdk_pixbuf_gif_anim_iter_get_pixbuf (GdkPixbufAnimationIter *anim_iter)
iter = GDK_PIXBUF_GIF_ANIM_ITER (anim_iter);
frame = iter->current_frame ? iter->current_frame->data : NULL;
frame = iter->current_frame ? iter->current_frame->data : g_list_last (iter->gif_anim->frames)->data;
#if 0
if (FALSE && frame)

2
gdk-pixbuf/io-gif-animation.h
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@ -76,6 +76,8 @@ struct _GdkPixbufGifAnim {
guchar bg_red;
guchar bg_green;
guchar bg_blue;
int loop;
};
struct _GdkPixbufGifAnimClass {

43
gdk-pixbuf/io-gif.c
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@ -83,7 +83,7 @@ enum {
GIF_GET_COLORMAP,
GIF_GET_NEXT_STEP,
GIF_GET_FRAME_INFO,
GIF_GET_EXTENTION,
GIF_GET_EXTENSION,
GIF_GET_COLORMAP2,
GIF_PREPARE_LZW,
GIF_LZW_FILL_BUFFER,
@ -149,6 +149,7 @@ struct _GifContext
/* extension context */
guchar extension_label;
guchar extension_flag;
gboolean in_loop_extension;
/* get block context */
guchar block_count;
@ -353,7 +354,7 @@ get_data_block (GifContext *context,
static void
gif_set_get_extension (GifContext *context)
{
context->state = GIF_GET_EXTENTION;
context->state = GIF_GET_EXTENSION;
context->extension_flag = TRUE;
context->extension_label = 0;
context->block_count = 0;
@ -376,8 +377,8 @@ gif_get_extension (GifContext *context)
}
switch (context->extension_label) {
case 0xf9: /* Graphic Control Extension */
retval = get_data_block (context, (unsigned char *) context->block_buf, NULL);
case 0xf9: /* Graphic Control Extension */
retval = get_data_block (context, (unsigned char *) context->block_buf, NULL);
if (retval != 0)
return retval;
@ -399,6 +400,36 @@ gif_get_extension (GifContext *context)
/* Now we've successfully loaded this one, we continue on our way */
context->block_count = 0;
context->extension_flag = FALSE;
break;
case 0xff: /* application extension */
if (!context->in_loop_extension) {
retval = get_data_block (context, (unsigned char *) context->block_buf, NULL);
if (retval != 0)
return retval;
if (!strncmp (context->block_buf, "NETSCAPE2.0", 11) ||
!strncmp (context->block_buf, "ANIMEXTS1.0", 11)) {
context->in_loop_extension = TRUE;
context->block_count = 0;
}
}
if (context->in_loop_extension) {
do {
retval = get_data_block (context, (unsigned char *) context->block_buf, &empty_block);
if (retval != 0)
return retval;
if (context->block_buf[0] == 0x01) {
context->animation->loop = context->block_buf[1] + (context->block_buf[2] << 8);
if (context->animation->loop != 0)
context->animation->loop++;
}
context->block_count = 0;
}
while (!empty_block);
context->in_loop_extension = FALSE;
context->extension_flag = FALSE;
return 0;
}
break;
default:
/* Unhandled extension */
break;
@ -1280,7 +1311,7 @@ gif_main_loop (GifContext *context)
retval = gif_get_frame_info (context);
break;
case GIF_GET_EXTENTION:
case GIF_GET_EXTENSION:
LOG("get_extension\n");
retval = gif_get_extension (context);
if (retval == 0)
@ -1349,6 +1380,8 @@ new_context (void)
context->gif89.delay_time = -1;
context->gif89.input_flag = -1;
context->gif89.disposal = -1;
context->animation->loop = 1;
context->in_loop_extension = FALSE;
return context;
}